Hasbún Hasbún, L. (2005). The effect of explicit vocabulary teaching on vocabulary acquisition and attitude towards reading. Universidad de Costa Rica.
Lua i Stíl Chicago (17ú heag.)Hasbún Hasbún, Leyla. The Effect of Explicit Vocabulary Teaching on Vocabulary Acquisition and Attitude Towards Reading. Universidad de Costa Rica, 2005.
Lua MLA (9ú heag.)Hasbún Hasbún, Leyla. The Effect of Explicit Vocabulary Teaching on Vocabulary Acquisition and Attitude Towards Reading. Universidad de Costa Rica, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.